Changes in the North Pacific Stationary-Transient Wave Interference and Downstream Impacts on Regional Climate Variability

Seminar by Dr. Mingyu Park from Princeton University

10 May 2023
KST 14:00 – 15:00

The Seminar is being held in Room 1010 (Jasmin) – Integrated mechanical engineering building. Click here for the campus map.

Wave interference between transient eddies and climatological stationary eddies is a key physical process that modulates heat and moisture transport by changing the large-scale circulation in the extratropics. The amplitude of wave interference becomes the largest during boreal winter when extratropical stationary waves and the associated zonally asymmetric forcing are strongest. Recent studies showed that the global wave interference in the wintertime can be driven by anomalous tropical and extratropical diabatic heating, which results in Arctic warming through enhanced poleward moisture and heat transport. In this study, we focus on the wave interference over the North Pacific Ocean where interference occurs most vigorously and is characterized by a quadrupole pattern of upper-level circulation anomalies. Through the analysis of observational data and simulations from the Seamless System for Prediction and Earth System Research (SPEAR), a coupled global climate model developed at the Geophysical Fluid Dynamics Laboratory, we address how such regional wave interference impacts climate extremes over North America in the current climate and how these downstream impacts will change in future projections. Our results indicate that the prediction of changes in structure of climatological stationary eddies and the regional wave interference is pivotal for understanding the future regional climate variability.